6442874165081 has 4 divisors (see below), whose sum is σ = 6480116212452. Its totient is φ = 6405632117712.

The previous prime is 6442874165047. The next prime is 6442874165089. The reversal of 6442874165081 is 1805614782446.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5733227981056 + 709646184025 = 2394416^2 + 842405^2 .

It is a cyclic number.

It is not a de Polignac number, because 6442874165081 - 2¹⁸ = 6442873902937 is a prime.

It is a super-2 number, since 2×6442874165081² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6442874165089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18621023426 + ... + 18621023771.

It is an arithmetic number, because the mean of its divisors is an integer number (1620029053113).

Almost surely, 2^{6442874165081} is an apocalyptic number.

It is an amenable number.

6442874165081 is a deficient number, since it is larger than the sum of its proper divisors (37242047371).

6442874165081 is a wasteful number, since it uses less digits than its factorization.

6442874165081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37242047370.

The product of its (nonzero) digits is 10321920, while the sum is 56.

The spelling of 6442874165081 in words is "six trillion, four hundred forty-two billion, eight hundred seventy-four million, one hundred sixty-five thousand, eighty-one".